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If someone is portly, they are fat in a round, solid way. The word is used most often of an older man, and it sounds a little old and polite — a softer way to say fat, the kind you meet in novels and in jokes about men in suits. Young people do not use it much. Long ago it was closer to “standing and walking in a way,” from an old sense of port meaning how you carry your body. The “round and heavy” meaning grew from that. You would not usually call a child portly, and you would not use it of someone who is only a little overweight in a sporty way.
發福的、肥胖的（多指年長男性，語氣較委婉）
組成From an old sense of port (“the way a person carries himself; bearing”) + -ly.
原始詞典資料2 筆記錄
以下是外部詞典記錄的用法，原文照列，我們還沒有寫成教學內容。上面的說明才是我們自己寫的；有些用法可能上面已經講過了。
portlyadj/ˈpɔːtli/
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Somewhat fat, pudgy, overweight.
- Indeed, the poor man has grown ten times as nervous as ever, since he has discovered, on such good authority, who the stout gentleman was. . . . He has anxiously endeavored to call up a recollection of what he saw of that portly personage; and has ever since kept a curious eye on all gentlemen of more than ordinary dimensions.
- In the length he attains, and in his baleen, the Fin-back resembles the right whale, but is of a less portly girth, and a lighter colour, approaching to olive.
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archaicHaving a dignified bearing; handsome, imposing.
- He ſends this Souldans daughter rich and braue, To be my Queene and portly Empereſſe, […]
- Portly his person was, and much increast Through his Heroicke grace and honourable gest.
資料來源：英文維基詞典 English Wiktionary（CC BY-SA 4.0）。 原文照列，未經改寫。